Which of the following is NOT considered a passenger vehicle?

Motorcycles are classified differently from passenger vehicles, which typically include enclosed vehicles designed to carry passengers. Passenger vehicles generally encompass cars, minivans, station wagons, and convertibles, all of which provide seating for passengers within an enclosed space. In contrast, motorcycles offer a very different design and use, serving primarily as a two-wheeled mode of transportation without any enclosure for passengers. This distinction is crucial in understanding vehicle classification, especially in contexts like road safety and law enforcement, where different types of vehicles may be subject to varying regulations and requirements.